人员精通业务
People know their business well
以上为机器翻译结果，长、整句建议使用 人工翻译 。
有些精通业务的医生和研究人员—虽然这些人不多，并且人数在进一步减少—不那么肯定吸卷烟对人体健康有影响。
Some competent physicians and research workers-though their small number is decreased even further-are less sure of the effect of cigarette smoking on health.
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